class_docstr: asr keras solver
code: def __init__(self, config):
      super().__init__(config)
  
imports: from pathlib import Path
  from datetime import datetime
  from absl import logging
  import delta.compat
  from tensorflow.keras import backend
  from tensorflow.keras.models import Model
  from tensorflow.keras.layers import Lambda
  from delta import utils
  from delta.utils.decode import py_ctc
  from delta.utils import metrics
  from delta.utils.solver.keras_base_solver import KerasBaseSolver
  from delta.utils.register import registers
  from delta.utils.solver.utils.callbacks import TokenErrMetricCallBack
  from delta.utils.decode.tf_ctc import ctc_greedy_decode
label_desc: Use image node_id 1 to create a new AsrSolver object from inherited base classes: KerasBaseSolver with example: obj = AsrSolver(config)